function ret = densityFunctionUniform(lower,upper)
   x = 0:0.1:90;
   y = ones(size(x))/90;
   u = 1;
   v = 1;
   while x(u) < lower
       u = u + 1;
   end
   while x(v) < upper
       v = v + 1;
   end
   if upper - lower < 0.1
       ret = 0;
   else
       ret = trapz(x(u:v),y(u:v));
   end
end

